BQ24171RGYT

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Battery chargers are an essential component in any electronic device. A battery charger would typically provide a certain amount of electrical current to recharge a device\'s battery to the full capacity of the battery. The BQ24171RGYT is a 4-cell, linear stand-alone battery charger for Li-Ion and Li-Po batteries. It is an integrated power management and battery charge controller offering low component count solution to extend system runtime. The BQ24171RGYT operates from an input voltage of 4.5V to 20V, and is designed to charge both 4-cell and 2-cell Li-Ion batteries. The device supports charging voltage up to 20V for 4-cell applications and 4.2V for 2-cell applications. It has a decent 1200mA charge current limit, low quiescent current, and lower external component count.

As to the application field of BQ24171RGYT, it mainly used in BQ24170PMUX-based adapters, battery powered systems, and other power management applications that require a high-efficiency constant voltage/constant current charger. It has a wide range of application areas such as portable electronics, handheld devices, tablet PCs and laptop computers.

In terms of its working principle, BQ24171RGYT operates in an input independent charge current mode when VBUS is ≥ 4.5V, which is suitable for wall adapter or USB input sources. It regulates the input current profile using Input Current Limitation (ICL) and Input Current Limitation Time (ICLT) based on the configuration data. An internal voltage regulator is used to maintain a constant charge voltage, depending upon the charger input voltage and the number of battery cells connected. The device also contains a Charge Current Limit circuit that can be programmed up to 1200mA. It will slowly reduce the current down to near 0mA when the battery is full, and will disconnect the battery and enter the standby state.

The BQ24171RGYT is an advanced, highly integrated, linear stand-alone battery charger, suitable for a range of power management applications. It features high efficiency charging, as well as support for 4- and 2-cell Li-Ion/Li-Po batteries. It has a wide operating range, a high level of integration, low component count, and low quiescent current.

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